Unlock instant, AI-driven research and patent intelligence for your innovation.

Preparation method and application of palladium/bamboo charcoal catalyst

A catalyst and bamboo charcoal technology, which is applied in the field of palladium/bamboo charcoal catalyst preparation, can solve the problems of low crystallite content and low metal Pd dispersion

Active Publication Date: 2015-09-30
CHINA PETROLEUM & CHEM CORP +1
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the low dispersion of metal Pd in ​​the catalyst that exists in the prior art, the problem that microcrystalline content is low, the invention provides a kind of preparation method of Pd / bamboo charcoal catalyst, the Pd / bamboo charcoal catalyst prepared by the inventive method is used for crude Hydrofining of isophthalic acid

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method and application of palladium/bamboo charcoal catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Take 500g commercially available bamboo charcoal material, the specific surface area is 550m 2 / g, the pore volume is 0.9mL / g, and the average pore (diameter) diameter is 6.5nm. The bamboo charcoal was acid-washed twice with 1.5 mol / L sulfuric acid at 75 °C, each treatment time was 2 h, the liquid-solid volume ratio was 3:1, and then washed until neutral and then dried. Prepare NO with sodium nitrite and water 2 The concentration is 0.05mol / L impregnation solution, equal volume impregnation active carbon carrier 8 hours, the preparation palladium weight content is 100 milliliters of the chloropalladium acid solution of 0.5%, then adjust the pH value to between 4~6 with alkali, stable 10 After ~200 minutes, the palladium-containing compound is supported by a spray-dipping method to obtain a catalyst precursor. After the catalyst precursor was aged for 12 hours, 20 grams of 5% sodium formate by weight and 200 grams of pure water were used to prepare a reducing solution,...

Embodiment 2

[0019] Bamboo charcoal was washed with 3 mol / L nitric acid at a washing temperature of 75°C, then washed with water until neutral, and the rest were the same as in Example 1. The catalyst product A-2 was obtained.

Embodiment 3

[0021] Bamboo charcoal is washed with the phosphoric acid of 5mol / L, and washing temperature is 80 ℃, then washes with water to neutrality, and all the other are with embodiment 1. The catalyst product A-3 was obtained.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
acid concentrationaaaaaaaaaa
specific surface areaaaaaaaaaaa
particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention relates to a preparation method and application of a palladium / bamboo charcoal catalyst. The palladium / bamboo charcoal catalyst is used for selective hydrogenation of crude m-phthalic acid and mainly overcomes the problems of poor dispersion of metal Pd and low minicrystal content in and poor thermal stability of a catalyst in the prior art. According to the invention, bamboo charcoal is used as a carrier, a Pd-containing solution is used for dipping of or is sprinkled on pretreated bamboo charcoal to prepare the palladium / bamboo charcoal catalyst, palladium is uniformly dispersed on the surface and secondary surface of bamboo charcoal, and a reducing agent is used for reduction so as to obtain the palladium / bamboo charcoal catalyst with high activity. Compared with a traditional palladium / charcoal catalyst, the palladium / bamboo charcoal catalyst provided by the invention has better activity, a longer service life and higher mechanical compressive strength.

Description

technical field [0001] The invention relates to a preparation method and application of a palladium / bamboo charcoal catalyst, which is used for selective hydrogenation of crude isophthalic acid. Background technique [0002] Supported palladium / carbon catalysts are mainly used for the selective hydrogenation of unsaturated organic compounds. The crude isophthalic acid obtained by the oxidation of m-xylene contains a certain amount of by-product impurities, and the existence of m-carboxybenzaldehyde (3-CBA for short) affects the quality and color of polyester, and it is difficult to use the usual crystallization method remove. However, after the selective hydrogenation of the supported palladium / carbon catalyst into m-toluic acid, it can be separated and purified by crystallization. Since the palladium / carbon catalyst usually uses a single active component, the research on its improvement has been focused on the structure of the support and the distribution of metal Pd on t...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/44C07C63/24C07C51/487
Inventor 汤涛王少军凌凤香王敏
Owner CHINA PETROLEUM & CHEM CORP
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com